linux-kernel - Re: v4.4-rc8 based tip tree kernel hangs on boot.

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Message-ID: <20160117173248.GA28841@linux.vnet.ibm.com>
Date:	Sun, 17 Jan 2016 23:02:48 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, linux-efi@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: v4.4-rc8 based tip tree kernel hangs on boot.

> >
> > So when I cherry-pick 67a9108 "x86/efi: Build our own page table
> > structures", the built kernel stops booting.
>
> Yeah, figures. At least that's less surprising that the linker script
> change causing your machine to stop booting.

Ok

>
> >
> > Attached the dmesg of a good kernel boot as requested by Matt.
>
> Can you confirm that CONFIG_DEBUG_WX isn't enabled in the .config you

I have run with both CONFIG_DEBUG_WX=y and #CONFIG_DEBUG_WX is not set.
But with both, "x86/efi: Build our own page table structures", the
kernel stops booting.

> used to test tip? Because the dmesg you attached shows that it is
> enabled, but it wasn't enabled in the .config you attached in the
> beginning of this thread.
>
> Was it disabled when you tested commit 67a9108?
>
> Could you try the following patch on top of commit c9f2a9a ("x86/efi:
> Hoist page table switching code into efi_call_virt()")? Be sure to
> enable CONFIG_EFI_PGT_DUMP and send me the output of dmesg.

Unfortunately even with your below patch on top of c9f2a9a ("x86/efi:
Hoist page table switching code into efi_call_virt()" also fails to boot
with and without CONFIG_DEBUG_WX=y. I have added CONFIG_EFI_PGT_DUMP.

Here is the dmesg with CONFIG_DEBUG_WX=y. and CONFIG_EFI_PGT_DUMP=y on
top of c9f2a9a ("x86/efi: Hoist page table switching code into
efi_call_virt()" (just in case if it helps)

--
Thanks and Regards
Srikar Dronamraju

View attachment "config" of type "text/plain" (187542 bytes)

View attachment "dmesg.txt" of type "text/plain" (117689 bytes)